Sustainable System for CO2 Capturing with Multiple Products

Abstract

Kenji Sorimachi and Hossam A.Gabbar

Currently, we are facing several serious issues, including diseases, climate change, economics, and wars. Among them, which needs to be resolved imminently to protect the future generations. Recently, we developed an innovative CO2 fixation and storage method based on the use of chemical compounds such as NaOH and CaCl2, to prevent the climate crisis. Herein, the electrolysis of a NaCl solution or seawater was performed to make the resultant NaOH react with CO2. Amines that react with CO2 were also examined. Moreover, seawater was used to produce CaCO3 rather than the CaCl2 solution. Although amines are currently used to capture CO2 from exhaust gases, the thermal treatment of the amine–CO2 complex solution is necessary to release CO2. Thermal treatment requires energy that eventually produces CO2 and induces the degradation of organic amines. However, the CO2 captured in the amine or NaOH solution was released easily by acidifying the CO2-containing solutions. Moreover, HCl could release CO2 from hydro carbonates, Ca(OH)2, Mg(OH)2, and mMgCO3·Mg(OH)2·nH2O, as well as from mineral carbonates, CaCO3 and MgCO3. This simple method of releasing the captured CO2 from the amine–CO2 complexes, hydro carbonates, and mineral carbonates is crucial to obtain pure CO2 for additional usage as an original material.

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